Intro to Python3 [2] - Software Testing Techniques (CIS640)

Intro to Python3
Venkatesh-Prasad Ranganath
Kansas State University

Python
• General-purpose
• Object-oriented
• Dynamically Typed
• Strong Typing
• Interpreted

Builtin Data Types
• Boolean
• True, False
• Integer
• 1234, -24, 0
• Float
• 3.14, 314e-2, 1., -.1

Builtin Data Types
• String
• Immutable
• “Python’s”
• ‘she said “Python”’
• “””String with newline character”””
• “This” “is” “one” “string” “literal”
• Operators — let’s look at scratch_pad.py
• Methods — for you to explore :)

Operators
• X <= Y
• X < Y
• X >= Y
• X > Y
• X == Y
• X != Y
• X is Y
• X is not Y
• X < Y < Z
• not X
• X and Y
• X or Y

Control Structure
• if-else or if-elif-else
• while-else
• for-else
• continue
• break
• try-except-else-finally
• pass (basically a no-operation statement)
• raise (similar to throw in Java/C#)
• : is used to terminate the
“header” of control structures
• Indentation is used mark-off code
blocks
• Don’t mix tabs and spaces in
indentation
• Use consistent indentation

Functions
def <function-name>(?<param-list>):
<body>
• Indentation is used to mark-off code blocks
• return ?<value> is used to return from functions
• Call-by-reference (for non-simple data types)
• Supports default arguments

Complex Data Types
• Tuples - (2, 4)
• Lists - [2, 4]
• Dictionaries - {2 : 4}
• Sets - set(‘spam’)
• Supports comprehension/generator expressions

Classes
class <class-name>(<parent-class>):
<attribute-def>
<function-def>
• Supports “constructor” method (__init__)
• Supports both class and instance attributes (ﬁelds)
• Supports both static and instance methods
• Does not support for access speciﬁers
• Supports inheritance

Putting it all together
• from x import y
• import y

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